Claude Explained
Learn about Claude.
Overview
- Claude is part of the artificial intelligence (AI) language model (LLM) family and was developed by the U.S. AI research company Anthropic.
- It was first released in March 2023 and has since evolved through several versions, including Claude 2, Claude 3, and Claude 4.
- One development goal is safety and responsible AI use, and for this it adopts the “Constitutional AI” approach.
- The name Claude comes from Claude Shannon, the French mathematician and pioneer of information theory.
- Like ChatGPT, it is a conversational AI model that performs text-based conversation, summarization, translation, code writing, document analysis, and more.
Versions and Evolution
| Version | Release period | |
|---|---|---|
| Claude 1 (initial) | Early 2023 | Basic release. |
| Claude 2 | July 2023 | Improved performance and response length. |
| Claude 3 family (Opus, Sonnet, Haiku) | 2024 | Model lineup by performance and speed. More diversified by use case. |
| Claude 4 family (for example, Opus 4, Sonnet 4.5) | 2025 | Strong for advanced tasks such as code generation. |
Features and Advantages
- Designed to perform many tasks such as natural language conversation, code generation, data analysis, and image input processing.
- Recent versions have a much larger context window, making them stronger at handling long context and solving complex problems. For example, Claude Sonnet 4.5 improved input/output token pricing and context window characteristics.
- Practical use is also considered, including APIs for developers and enterprise customers, agent usage, and tool integration.
Main Features
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Focus on safety and transparency
- Focuses on avoiding harmful answers and providing reasonable, explainable responses.
-
Long context processing
- The Claude 3 series can understand up to 200,000 tokens, about 150-200 pages, making it strong for analyzing long documents.
-
Intuitive conversation
- It has strong language ability in naturally understanding the user’s intent and nuance.
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Enterprise API support
- Supports workflow automation and document processing through integrations with Slack, Notion, Zapier, and more.
Differences from ChatGPT
| Category | ChatGPT (OpenAI) | Claude (Anthropic) |
|---|---|---|
| Developer | OpenAI | Anthropic |
| Representative models | GPT-4, GPT-5 | Claude 3 series |
| Philosophy | Efficiency and accuracy focused | Safety and human-centered design |
| Strengths | Code writing, many integrations | Document understanding, ethical control |
| Context length | About 128k tokens (GPT-4 Turbo) | About 200k tokens (Claude 3) |
Use Cases
- Companies use it for coding automation, document summarization, data analysis, chatbot responses, and more. It is also mentioned for code refactoring and bug fixing.
- General users can also have natural conversations through web and mobile chat interfaces.
- It is preparing to enter the Korean market, and cooperation with Korean companies and policy organizations is also underway.
Limitations and Notes
- It is not yet a “complete artificial intelligence” (AGI) or a self-aware system, and errors or false information (“hallucinations”) may occur. For example, cases have been reported where a model generated incorrect legal citations.
- For corporate or organizational use, licensing, data security, and regulatory compliance are important.
- Safety and ethical considerations are required from companies and developers, and access restrictions for companies in certain countries are also being discussed.
Notes for Korean Users
- Korean input and output are possible, but response quality may be somewhat lower than in native-language environments such as English, so review is needed for important work.
- Although entry into the Korean market is planned, a domestic specialized version or full localization may not yet be complete.
- Depending on the purpose of use, it may be divided into free or paid plans, and APIs may incur costs.